If like me you have a Win 10 Pro system with two monitor displays, both connected via a spare graphics card, in my case a GTX1080. when you install any Nivida driver newer than 411.63 you will get an error saying "This GPU only supports one display" & no longer able to use a dual monitor setup with your rig.
I have been on to Nivida about this, but they have come back and said they don't support multi GPU systems of this kind. They seem very unwilling to look at their buggy driver & only will support system with 2 SLI cards.
My report ref is:
GPU only supports 1 display with multiple GTX 1080s [Incident: 181122-000127]
If you also have this problem, please quote my report ref.
Shaun.